292 



INDEX. 



Kolliker, epiblast in embryos of mam- 

 mals, 101; protovertebiffi, 115, 119; 

 membranaelastica externa, 151, 155; 

 double formation of heart, 231 ; su- 

 prarenal bodies, 239 



Kowalevsky, Prof ., mesoblast in Euaxes 

 and Ascidians, 52 ; development of 

 Ascidians, 67 ; formation of the lay- 

 ers, 70; communication of neural 

 and alimentary canals, 91 ; origin of 

 the notochord, 96 ; derivation of 

 mesoblast in Amphioxus, 119; de- 

 velopment of Brachiopoda, 123 ; 

 postanal section of alimentary tract, 

 218 



Kupffer, germinal vesicle, 8, 9; origin 

 of the notochord, 96 



Lankester, Prof. ,development of Cepha- 

 lopoda, 55 ;* origin of mesoblast, 122 



Lateral line; previous investigations, 

 141 ; distinctness of lateral line and 

 lateral nerve, 141 ; lateral nerve a 

 branch of vagus, 142, 146; lateral 

 line a thickening of epiblast, 143; 

 its conversion into a canal, 144 ; 

 formation of its segmental apertm*es, 

 144 ; mucous canals of the head, 

 144 ; their nerve supply, 145 ; Sem- 

 per's and Gotte's view of lateral 

 nerve, 145, 146 



Lateral nerve, 141 ; a branch of vagus, 

 142 



Layers, formation of the, 33— 70 



Leuciscus rutilus, segmentation cavity, 

 33 



Leydig, external appearance of the 

 blastoderm, 10; segmentation, 31; 

 horny and mucous layers of epiblast, 

 99; annelidan nervous system, 167; 

 suprarenal bodies, 173; circulation 

 of the yolk-sack, 236; origin of su- 

 prarenal bodies, 237, 240, 245; 

 Wolffian body and Wolffian duct, 

 250 



Lieberldihn, Prof., mesoblast in Mam- 

 malia, 49 ; development of noto- 

 chord, 96 ; vitreous humour in mam- 

 mals and birds, 188 



Limb-muscles, their derivation from 

 muscle-plates, 149 



Liver, arises as ventral diverticulum 

 of duodenum, 226 ; hepatic cylinders, 

 226; comparison with other types, 

 227 



Loligo, eggs of, 56 



Lumbricus, derivation of mesoblast, 

 121 



Lymnaeus, mesoblast of, 52, 122 



Malpighian bodies, 255—264 



Mammalia, germinal vesicle, 5; meso- 

 blast, 49, 52 ; neural and elementary 

 canals, 91; ovum, 92; embryo, 114; 

 double formation of heart, 231; su- 

 prarenal bodies, 247 



Marshall, development of nerves in 

 birds, 161, 213 



Marsipobranchii, neural and alimen- 

 tary canals, 91; absence of limbs, 

 104 



Medullary canal, 84 



Medullary groove, formation of, 44, 54, 

 71, 73; its conversion into medul- 

 lary canal, 82 ; stages B — G, 83 



Medusae, protoplasmic network in ova, 

 53 



Membrana elastica externa, 151, 153 



Meroblastic eggs, 55, 56 ; segmenta- 

 tion of, 27, 53, 65, 66, 68, 69 



Mesoblast, formation of, 45, 48, 49, 51, 

 54, 68, 74, 75, 94 ; in two lateral plates, 

 49 ; stages B— G, 85 ; its division into 

 somatic and splanchnic layers, 85; 

 formation of protovertebrre, 86 ; late- 

 ral jDlates, 86; caudal swellings, 87; 

 formation of body cavity in the head, 

 87 ; stages G — K, constitution of 

 lateral plates, 104 ; their splanchnic 

 and somatic layers, 104, 112; body 

 cavity between them, 105, 112 ; their 

 division into lateral and vertebral 

 plates, 105, 112; protovertebrae, 105; 

 division into muscle-plates and ver- 

 tebral bodies, 107, 112 ; development 

 of muscle-plate, 106; disappearance 

 of segmentation to form vertebral 

 bodies, 107 ; intermediate cell-mass, 

 108; body-cavity and parietal jjlates, 

 109 ; primitive halves of body-cavity, 

 109 ; their ventral fusion, 110; peri- 

 cardial cavity, 110; communication 

 of pericardial and peritoneal cavities, 

 110 : somatopleure and si^lanchno- 

 pleure, 110; general considerations, 

 113; lateral plates and alimentary 

 diverticula, 122; secondary segmen- 

 tation of vertebral column, 126 



Mesoblast of Head, 206—209; body- 

 cavity and myotomes of head: con- 

 tinuity of body-cavity into head, 206 ; 

 its division into segments, 206; de- 

 velopment of muscles from their 

 walls, 208 ; general mesoblast of 

 head, 208 



Metschnikoff, germinal vesicle, 8 ; pro- 

 toplasmic network in ova, 53 ; Ophi- 

 ura and Amphiura, 123 



Mihalkowics, pituitary body in birds, 

 190 



]\Iikluclio-Maclay,developmcnt of brain, 

 182 



